ProjectExplorer: De-virtualize some more virtual methods

Use setters/getters for the bool flags in
Project::needsBuildConfigurations() and
Project::hasMakeInstallEquivalent.

Change-Id: I5ce937c3a5e8e0db627cda02a9007f8c28ccda0c
Reviewed-by: hjk <hjk@qt.io>

src/plugins/cmakeprojectmanager/cmakeproject.h

@@ -99,7 +99,6 @@ private:
     QStringList filesGeneratedFrom(const QString &sourceFile) const final;
 
     ProjectExplorer::DeploymentKnowledge deploymentKnowledge() const override;
-    bool hasMakeInstallEquivalent() const override { return true; }
     ProjectExplorer::MakeInstallCommand makeInstallCommand(const ProjectExplorer::Target *target,
                                                            const QString &installRoot) override;